Ferriprehnite
A valid IMA mineral species
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Formula:
Ca2Fe3+(Si3AlO10)(OH)2
Colour:
Colourless to pale green
Lustre:
Vitreous
Hardness:
6½
Specific Gravity:
2.97 (Calculated)
Crystal System:
Orthorhombic
Name:
Named for being the Fe3+ analogue of prehnite.
Unique Identifiers
Mindat ID:
55129
Long-form identifier:
mindat:1:1:55129:0
GUID
(UUID V4):
(UUID V4):
8f6d7c62-e6c8-43f2-9059-ebc7e03463a2
IMA Classification of Ferriprehnite
Approved
IMA Formula:
Ca2Fe3+(AlSi3)O10(OH)2
Approval year:
2020
First published:
2021
Classification of Ferriprehnite
9.DP.
9 : SILICATES (Germanates)
D : Inosilicates
P : Transitional ino-phyllosilicate structures
9 : SILICATES (Germanates)
D : Inosilicates
P : Transitional ino-phyllosilicate structures
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Fprh | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Ferriprehnite
Vitreous
Transparency:
Transparent
Colour:
Colourless to pale green
Streak:
White
Hardness:
6½ on Mohs scale
Cleavage:
Distinct/Good
on {100}
on {100}
Density:
2.97 g/cm3 (Calculated)
Chemistry of Ferriprehnite
Mindat Formula:
Ca2Fe3+(Si3AlO10)(OH)2
Crystallography of Ferriprehnite
Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Pma2
Setting:
Pma2
Cell Parameters:
a = 18.6149(10) Å, b = 5.4882(3) Å, c = 4.6735(3) Å
Ratio:
a:b:c = 3.392 : 1 : 0.852
Unit Cell V:
477.46 ų
Comment:
Fe substitution for Al makes the a and c dimensions longer
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
4.674 Å | (32) |
3.558 Å | (32) |
3.495 Å | (54) |
3.324 Å | (45) |
3.298 Å | (43) |
3.087 Å | (100) |
2.572 Å | (77) |
1.779 Å | (45) |
Type Occurrence of Ferriprehnite
General Appearance of Type Material:
Radial aggregates of crystals comprising both ferriprehnite and prehnite; tabular crystals, up to 300 µm in length, 100 µm in width, and 50 µm thick.
Place of Conservation of Type Material:
National Science Museum Japan (NSM M-47662).
Geological Setting of Type Material:
Hydrothermally altered dolerite.
Associated Minerals at Type Locality:
Reference:
Nagashima, M., Nishio-Hamane, D., Ito, S., Tanaka, T. (2021) Ferriprehnite, Ca2Fe3+(AlSi3)O10(OH)2, an Fe3+ analogue of prehnite, from Kouragahana, Shimane Peninsula, Japan. Journal of Mineralogical and Petrological Sciences: 116: 129-139.
Synonyms of Ferriprehnite
Related Minerals - Strunz-mindat Grouping
9.DP.05 | Meliphanite | (Ca,Na)2(Be,Al)[Si2O6(OH,F)] |
9.DP.15 | Leucosphenite | BaNa4Ti2B2Si10O30 |
9.DP.20 | Prehnite | Ca2Al2Si3O10(OH)2 |
9.DP.25 | Amstallite | CaAl[(Al,Si)4O8(OH)2](OH)2 · (H2O,Cl) |
9.DP.30 | Kvanefjeldite | Na4(Ca,Mn)(Si3O7)2(OH)2 |
9.DP.35 | Lemoynite | (Na,K)2CaZr2Si10O26 · 5H2O |
9.DP.35 | Natrolemoynite | Na4Zr2Si10O26 · 9H2O |
9.DP.35 | Hogarthite | (Na,K)2CaTi2Si10O26 · 8H2O |
9.DP.40 | Altisite | Na3K6Ti2Al2Si8O26Cl3 |
9.DP.45 | Chiappinoite-(Y) | Y2Mn(Si3O7)4 |
9.DP.50 | Esquireite | BaSi6O13 · 7H2O |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Ferriprehnite
mindat.org URL:
https://www.mindat.org/min-55129.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Ferriprehnite
Reference List:
Miyawaki, Ritsuro, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2020) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 58. European Journal of Mineralogy, 32 (6) 645-651 doi:10.5194/ejm-32-645-2020
Localities for Ferriprehnite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Japan (TL) | |
| Miyawaki et al. (2020) +1 other reference |